1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright 2019 NXP.
4 */
5
6#include <dt-bindings/firmware/imx/rsrc.h>
7#include <linux/firmware/imx/sci.h>
8#include <linux/slab.h>
9#include <linux/sys_soc.h>
10#include <linux/platform_device.h>
11#include <linux/of.h>
12
13static struct imx_sc_ipc *imx_sc_soc_ipc_handle;
14
15struct imx_sc_msg_misc_get_soc_id {
16	struct imx_sc_rpc_msg hdr;
17	union {
18		struct {
19			u32 control;
20			u16 resource;
21		} __packed req;
22		struct {
23			u32 id;
24		} resp;
25	} data;
26} __packed __aligned(4);
27
28struct imx_sc_msg_misc_get_soc_uid {
29	struct imx_sc_rpc_msg hdr;
30	u32 uid_low;
31	u32 uid_high;
32} __packed;
33
34static int imx_scu_soc_uid(u64 *soc_uid)
35{
36	struct imx_sc_msg_misc_get_soc_uid msg;
37	struct imx_sc_rpc_msg *hdr = &msg.hdr;
38	int ret;
39
40	hdr->ver = IMX_SC_RPC_VERSION;
41	hdr->svc = IMX_SC_RPC_SVC_MISC;
42	hdr->func = IMX_SC_MISC_FUNC_UNIQUE_ID;
43	hdr->size = 1;
44
45	ret = imx_scu_call_rpc(imx_sc_soc_ipc_handle, &msg, true);
46	if (ret) {
47		pr_err("%s: get soc uid failed, ret %d\n", __func__, ret);
48		return ret;
49	}
50
51	*soc_uid = msg.uid_high;
52	*soc_uid <<= 32;
53	*soc_uid |= msg.uid_low;
54
55	return 0;
56}
57
58static int imx_scu_soc_id(void)
59{
60	struct imx_sc_msg_misc_get_soc_id msg;
61	struct imx_sc_rpc_msg *hdr = &msg.hdr;
62	int ret;
63
64	hdr->ver = IMX_SC_RPC_VERSION;
65	hdr->svc = IMX_SC_RPC_SVC_MISC;
66	hdr->func = IMX_SC_MISC_FUNC_GET_CONTROL;
67	hdr->size = 3;
68
69	msg.data.req.control = IMX_SC_C_ID;
70	msg.data.req.resource = IMX_SC_R_SYSTEM;
71
72	ret = imx_scu_call_rpc(imx_sc_soc_ipc_handle, &msg, true);
73	if (ret) {
74		pr_err("%s: get soc info failed, ret %d\n", __func__, ret);
75		return ret;
76	}
77
78	return msg.data.resp.id;
79}
80
81int imx_scu_soc_init(struct device *dev)
82{
83	struct soc_device_attribute *soc_dev_attr;
84	struct soc_device *soc_dev;
85	int id, ret;
86	u64 uid = 0;
87	u32 val;
88
89	ret = imx_scu_get_handle(&imx_sc_soc_ipc_handle);
90	if (ret)
91		return ret;
92
93	soc_dev_attr = devm_kzalloc(dev, sizeof(*soc_dev_attr),
94				    GFP_KERNEL);
95	if (!soc_dev_attr)
96		return -ENOMEM;
97
98	soc_dev_attr->family = "Freescale i.MX";
99
100	ret = of_property_read_string(of_root,
101				      "model",
102				      &soc_dev_attr->machine);
103	if (ret)
104		return ret;
105
106	id = imx_scu_soc_id();
107	if (id < 0)
108		return -EINVAL;
109
110	ret = imx_scu_soc_uid(&uid);
111	if (ret < 0)
112		return -EINVAL;
113
114	/* format soc_id value passed from SCU firmware */
115	val = id & 0x1f;
116	soc_dev_attr->soc_id = devm_kasprintf(dev, GFP_KERNEL, "0x%x", val);
117	if (!soc_dev_attr->soc_id)
118		return -ENOMEM;
119
120	/* format revision value passed from SCU firmware */
121	val = (id >> 5) & 0xf;
122	val = (((val >> 2) + 1) << 4) | (val & 0x3);
123	soc_dev_attr->revision = devm_kasprintf(dev, GFP_KERNEL, "%d.%d",
124						(val >> 4) & 0xf, val & 0xf);
125	if (!soc_dev_attr->revision)
126		return -ENOMEM;
127
128	soc_dev_attr->serial_number = devm_kasprintf(dev, GFP_KERNEL,
129						     "%016llX", uid);
130	if (!soc_dev_attr->serial_number)
131		return -ENOMEM;
132
133	soc_dev = soc_device_register(soc_dev_attr);
134	if (IS_ERR(soc_dev))
135		return PTR_ERR(soc_dev);
136
137	return 0;
138}
139